Require Symfony 2.3.4

Author: wouterj

.travis.yml

@@ -28,7 +28,7 @@ matrix:
     - php: 5.6
       env: SYMFONY_VERSION=3.0.*@dev
     - php: 5.3.3
-      env: SYMFONY_VERSION=2.3.* COMPOSER_FLAGS="--prefer-lowest"
+      env: SYMFONY_VERSION="2.3.*,>=2.3.4" COMPOSER_FLAGS="--prefer-lowest"
   allow_failures:
     - php: 5.6
       env: SYMFONY_VERSION=2.8.*